Earlier quoted context omitted.
Absolutely... the spirit of reducing waste and consumerism is admirable, but this guy is being ridiculous by claiming that he only owns "15 things". Not only is he missing the point, but his hyperbole is out of control. A toiletry kit is 1 item? Right. Bike Snob NYC has a hilarious post on Hyde if you haven't seen it: http://bikesnobnyc.blogspot.com/2011/05/paring-down-and-pair...
Actually, the OP provides a fairly insightful definition of "item": I count my things as resellable items I would be pissed if someone took. By this definition an "item" is "one emotional connection to an object", not merely an object itself. Yes, this means that the guy carries around many more physical objects than he counts as "items". This seems emotionally healthy, though, if one can afford it. And affording it…
This would be a pretty odd definition of an "item". Going with this definition though, I (and suspect quite a few others) don't have more than 1-2 "items", or even any at all. I can't think of a single (physical) object I have emotional connection to, as long as I am reimbursed so that I can replace it it's business as usual.